Uhderfeed stokeb furnace



M 1927' E. LUNDGREN UNDERFEED STOKEJR FURNACE 2 Sheet's-Shet 1 Filed Sept. 9. 1922 awuemto'c fawmr LUNOG/EEM May 10,1927.

UNDERFEED STOKER FURNACE Filed Sept. 9. 192 2 2 Sheets-Sheet 2- $5 Gam 1,628,166 E. LUNDGREN I FlIEFL 3 ltl, rear.

l tilltl ldd EDWIN LUNIDGREN, 01*" FREDERICK, MARYLfiaND, l-lt tllltlllltlltt T0 COMB'USTIUN ENGI- NEERING CURY'URATION, Oli NEW Y'Ol-llll, N. 521, A CUlttIUlttA'ElUll 015 NEW ORE.

UNDERFEED STOKER FURNACE.

Application filed September 9, 1922.

Mv inventionrelates to underfeed stoher furulices, and has forits object to prov de novel and improved means for preventing clinhers from forming on the side walls of such furnaces. It further has for its obyect to produce a novel construction in whlch the parts are easily renewable.

'lhe several features of the invention will be clearly understood from the following description and accompanying drawings, in which, p

Figure l is a longitudinal sectional view, partly in elevation, withparts brolzen a try and parts removed of an underfeed furnace embodying the features of the 1nvention in their preferred form;

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1;

Fig" 3 shows detail side and front elevations of a tuyere block forming a component part of my improyed construction; 1

Fig. 4c is a detail slde elevation of an end tuyere structure forming another component part;

Fig. 5 is a detail sectional view partly in elevation, taken on the line 5 -5 of Fug. 1;

Fig. 6 shows detail front, side and bottom views of an end tuyere structure forming another component part of my improved construction Fig. 7 shows detail side and bottom vlews of another component part; and

Fig. 8 is detail side and bottom views of still another component part.

The underfeed furnace illustrated in the drawings is of the multiple retort type with the outer wall 2 of the outer retort l spaced.

from a side wall 6 of the fire box of the furnace. llu carrying out my invention 1 provide a supporting wall 8 corresponding to and arranged parallel with the outer retort wall 2 and adjacent to the fire box side wall. An angular shaped supporting; member 10 is mounted on the upper edges of the walls 2 and 8 and is provided with an upright portion in the form a rail 11 arranged adjacent the the box side wall. The supporting member 10 extends substantially the length of the retort and is made in sections that are arranged end to end. Each section of the member 10 is held in position by means of a depending lug- 12 on the has of said section which extends between the walls 2 and 8 (Figs. 1 and 2). Each lug 12 is provided with an aperture that retlerial No. 58?,050.

ceives the hooked end of an anchor bolt 13 which extends through an inverted ll-shaped clamping member or yolre 1% having its ends abutting the under sides of inwardly turned flanges on the upper edges of the walls 2 and 8. 'lhis holding means for each section is located near the rear end of the section, except that the forward end section is provided with such means near both ends, the front end of each section other than the forward end section being securely held in position by an overlapping portion 16 of the next section in front thereof. Thus the several sections of the supporting member 10 are securely held in place and may be easily removed and replaced.

A row of tuyere blocks 18 is mounted on the supporting member 10. Each tuyere block is provided with an exposed wall 20, the lower end of which is turned inwardly so as to abut a shoulder 22 on the base of said member 10. The base of said member 10 forms a ledge or dead plate which is provided with upstandingtransverse reenforcing ribs 23. The upper end of the exposed wall 20 of each tuyere block is curved outwardly to the lire box side wall. llhe portion of said exposed wall extending between the lower end thereof and said curved upper end portion is arranged in a vertical plane and extends through and along the zone of clinker formation. Each tuyere block is provided with an outwardly projecting rib :24, the upper portion of which is provided with laterally projecting flanges 26 having their edges respectively in the planes of the edges of the exposed wall of the tuyere block. Means are provided that cooperate with the shoulder 22 to securely hold the tuyere blocks in position. As shown, the upper edge portion of the rail ll isoflset inwardly to form a vertical flange 30 that interlocks with the wall of a transverse slot in the rib 2d of each tuyere block, the slot being provided with shoulders 32 that abut shoulders on the offset edge portion oi the rail. With this con struction, it will be apparent that the tuyere blocks can be removed and replaced only by sliding them longitudinally of the rail.

Tuyere structures and 36 are arranged at the rear and forward ends, respectively, of the row of tuyere blocks. The tuyere structure 34- is mounted on a horizontal support 38 that constitutes a part of the support for the overteed grate hars (not shown).. This tuyere structure is held in position by its forward edge wall abutting the rear wall of the last one of the row of tuyere blocks, and by a depending anchor lug on its base being hooked under a shoulder on the support 38. The tuyere structure 34.- is further provided with a vertical exposed wall 4-2 that is arranged in the plane oi the vertical exposed walls of the tuyere blocks 18; an outer wall at which is spaced from the wall 42 and arranged adjacent the the box; side wall 6; and a closed rear end wall 4:6 connecting the walls l2 and id.

The forward end tuyere structure 36 is provided with a vertical exposed wall T8 which is in the plane of the exposed walls oi the tuyere blocks 18 and has its lower edge turned inwardly so as to engage the shoulder 22 on the supporting member 10. This structure is further provided with a closed front end wall 50 that extends from the terward edge of the exposed wall to the fire box side wall. The upper portion or the tuyere structure 36 is provided with a depending outer wall 52 which is spaced from the ere posed wall as and is arranged adjacent the lire box side wall. Two spaced bars 54- connect the lower end of the depending wall 59 and the exposed wall These bars 5% are provided with transverse notches 56 on their under sides that are arranged to engage the flange 30 of the supporting rail ll when the parts are assembled. The exposed wall 48 is provided with spacing lugs 57 at its lower end for engagement with the rail 11. The tuyere structure 86 is detachably secured to the supporting member 10 by means of a depending lug 58 thereon having an aperture that receives the hooked end of an anchor bolt 60, the lower end or which ertends through an aperture in a cross bar 62 connecting the walls 2 and 8 and provided with a clamping nut 64 screwthreaded on its lower end.

A lining 65 of asbestos is interposed between the structure as a whole and the side wall 6 of the fire box so as to form a tleizihle seal between the underi eed s'tolrer and the side wall.

The adjacent front and rear edges of the exposed walls of the several tuyere blocks 18 and the tuyere structures 34 and 86 are provided with downwardly and inwardly inclined ribs (36 and grooves (:38. The grooves 68 are wider than the ribs 66 and centrally receive the ribs so as to provide downimrdly and inwardly inclined tuyere openings TO leading from the interior oi? the blocks 18 into the firebon. The exposed walls of the tuyere structures 34 and 36 are provided with inwardly tapering tuyere openings 72; and the bases of the supporting member 10 and tuyere structure 3% are provided with horizontal slots or grooves 74 that cooperate penance with the upper i, of the outer rotor-t wall 2 and the pport it, respectIrolp, to iorin tuyiire openings .iciu'hug into the lire hon.

From the foregoing it will be apparent that the several tuyerc hloehs lth tuyiiro structures 3i and till :1 nd supporting member 10 all cooperate to term an air chamber to which air may be supplied through the space between the walls and il tl air lie-- ing directed into the lire box: through the several luyere openin s so to maintain the structure below a teniperatiare which will. cause damage to the sunie to piercnt the adhesion oil' clinhors and to promote colubusti-on The structure ot rigid, strong and durahle cons-itruction and the component parts thereot' may he ozusil v assembled and taken apart. Tn care one or more ol" the vertical tuyere bloc-his should become broken or burned, it nuiy he easily replaced by ren'ioving the trout and tu yei'e structure and sliding the blocks do uu to 'i'iliih the place o I? the broken one, the latter heing previously broken oil oil its supportw The exposed por tion oi the supporting member '10 Llorius a horizontal dead plate liiirated at a point where it atruuts and :5 port burned out ash and so as to he protected iliroin excessive heat, so that there litle daiu er of its be ing burned so as to rcru'lire renewal.

its will be evident to those slsiilled .iu the art, my invention perniits oi? various iuodilications without departing from the spirit thereof or the scope ot the appeiuled rlaiuis.

d hatll claim is:

1. An underl'ced stolrer furnace having, in coinbinatioin a tool retort having its outer wall spaced troin a side wall oi? the iire be); of the turiuue a supporting}; wall arranged adjacent said tire hon i 1 wall, a supp ing ineiniier mounted on the upper edges of said retort wall and said siu u uirtiug wall, and a row of tuyero hloclts mounted on said supporting member and extending); upwardly to a point on said side wall ahove the normal none oi? clinhc 'ioru'iatiou with the lower edges oi. their ot tp iuod 'l'uros s 'iaccd outward from the inner odgjrc o'l' said supporting l'nGllllIiQl' so as to l'orni a dead plain atjaccnt the exposed fares oi "i hloclor said supporting member and said row o'l'j tuycre hloch's hein in. co:unuiuication with the space hetwcen said retort wall and said sup' iorting wall.

2. rin luulcrjl'ced stoli'er ii'urnzuro having, in cornb'iiuition, a .liuol retort having its outer wall spaced from a side wall o l the lire how of the furnace, a sl'uu'iortiug wall ai'ruuguul adjacent said lire hon wall a suppo ting member having a limo portion extruding hetween the upper edges at mid retort and supporting mall and having a vertical Elm" tion in the form ()iii a rail urraup d adjacent the lire boa side wall and having its upper till iii)

ll llll ill] lilo

combination, a fuel retort having its outer wall spaced from a side wall of the fire box of the furnace, a supporting member having a base portion extending between the upper edges of said retort wall and said fire box side wall and having an upwardly projecting portion in the form of a rail arranged adjacent to and longitudinally of said fire box side wall, and a row of tuyere blocks mounted on said supporting member having their exposed surfaces extending upwardly to a point on said fire box side wall above the normal zone of clinker formation, said tuyere blocks and rail portion of said supporting member having interlocking portions that are arranged to engage to hold the tuyere blocks on said supporting member and permitting them to be applied to and removed from said "ail portion by sliding them longitudinally thereof, and each of said tuyere blocks having the lower edge of its exposed face spaced a distance outward from the inner edge of said base portion.

4;. An under-feed stoker furnace having, in combination, a fuel retort having its outer wall spaced from a side wall of the fire box of the furnace, a supporting wall arranged adjacent said fire box side wall, a supporting member mounted on the upper edges of said retort wall and said supporting wall, a row of tuyere blocks mounted on said sup porting member having their faces extending upwardly to a point on said fire box side wall above the normal zone of clinker formation, and tuyere structures at the ends of said row of tuyere blocks having their outer end walls extending to said fire box side wall and cooperating with said tuyere blocks to form an air chamber.

5. An underfeed stoker furnace having, in combination, a fuel retort having its outer wall spaced from a side wall of the fire box of the furnace, a supporting wall arranged adjacent said fire box side wall, a supporting member having a base extending between the upper edges of said retort wall and said supporting wall having a vertical portion in the form of a rail arranged adjacent said fire box side wall and having a shoulder on its base spaced inwardly from said vertical portion, a row of tuyere blocks mounted on said supporting member each having its exposed face arranged substantially in a vertical plane, having its lower end provided with a shoulder that abuts :ragainst said upwardly extending shoulder on the base of said supporting member and 1- having a portion that interlocks with the if-of its exposed face spaced a distance outward from the inner edge of said base.

6. A underfeed stoker furnace having, in combination, a fuel retort having its outer wall spaced from the side wall of the fire box of the furnace, a supporting member extending between the upper edge of sald retort wall and said fire box side wall, and 'a row of tuyere blocks having the lower ends of their exposed surfaces spaced outward from the inner edge of said supporting member so as to form a dead plate between said exposed surface. and said inner edge of the supporting member, said exposed surface having a vertical portion extending from said supporting member to a point above the normal zone of clinker formation and being curved upwardly and outwardly from said point to said fire box side wall. 7

7. An underfeed stoker furnace having, in combination, a fuel retort having its outer wall spaced from a side wall of the fire box of the furnace, a supporting member having its base mounted on the upper edge of said outer wall and extending substantially to said side wall of the fire box, and a tuyere structure comprising a row of tuyere blocks mounted upon said supporting member each having its exposed face arranged substantially parallel with said side wall and extending above the normal zone of clinker formation and having its lower edge spaced a distance outward from the inner edge of said base portion.

8. An underfeed stoker furnace having, in combination, a downwardly and rearwardly inclined retort having its outer wall spaced from a side wall of the fire box of the furnace, a tuyere structure extending from the upper edge of said outer wall of the retort to a point above the normal zone of clinker formation comprising a tuyere block arranged adjacent the lower end of the retort having a fuel supporting wall spaced from the adjacent side wall of the fire box and having an outwardly projecting wall extending to said side wall of the fire box and from the upper end of its forward edge to the lower end of its rear edge, a row of tuyere blocks arranged one against the other above the upper edge of said retort wall with the rearmost block engaging the forward edge of the fuel supporting wall of said end tuyere block, the tuyere blocks of said row being adapted to be moved in a direction parallel with the upper edge of said side wall of the retort and being held from rearward movement by said rear end tuyre block, and a tuyere block removably mounted adjacent to the upper end of the retort having its fuel supporting face arranged in the plane of the fuel supporting faces of the tuyre blocks of said row and having its I'GZLI edge abut ting against the foremost tuyere block so :nenmee that said tn'yol'e blocks were held between the front and rear end blocks, mid Front end block having its front wall extending to the s1de Wall of the [ire box, and said tnyFn-e 1' L -"1 e 1b] 4" t't t' WW1 L3G ts .nn no em .oow eons 1,11 111, om, well 01' an an passage arranged above and retort Wall.

ICUVHN I U N D t '1 EIQEN. 

